According to the 2014 survey, about 8 per cent of Britons show symptoms that could affect the season and 21 marks on worse disorder, just a kind of 'winter depression'.

What are the causes of occasional disturbance?

But what causes the seasonal impact of disorder? Some theories say that it is caused by sunshine in winter. According to this theory, people in countries far from the equator, such as Iceland, should be the main victims, but this has not been proven. Another theory says that this problem has been troubled by circadian rhythm, which fears the way night is passing through the winter.

Others suggest that the problem is in uneven levels of serotonin and melatonin in the body. Serotonin gives us energy, melatonin causes trouble. It is possible that the body produces too much melatonin in people who suffer from seasonal disorder, so they feel overweight and tired.

In the game you have several options. Eye irritation may also affect human disturbance on a seasonal disorder. 175 students from two universities – one in south Wales, the other in Cyprus – participated in one review. It has been found that people with lighter eyes are suffering from seasonal seasonal disorder than those with dark eyes. Different eyes can handle different amounts of light.

Blue eyes are more sensitive to light

The retina has light-hearted cells in the human eye. When light passes into the eye, these cells spread the nerves that make the image in the brain. But in 1995, researchers found that some cells on the retina are not taking part in this process, but just sending information to the hypothalamus about the clarity of the image. The hypothalamus is a very important part of the brain that distributes hormone that controls temperature, hunger and sleeping.

As the amount of blue and green light reaching the hypothalamus increases, the rate of melatonin is decreasing. Eyes with less color – blue or gray – are more sensitive to light. People with light eyes spread less melatonin in autumn and winter than in darkness. Thus it is possible that people with blue-throats are more likely to be opposed to seasonal seasonal disorder.

Why do blue eyes in the Western Isles live a long way from the equator? Some theories say they are more attractive and so do have benefits. Or that blue eyes are a bad consequence of more lighter skin color.

This guide has grown because it helps people make enough vitamin D even in places where the sun only draws in winter. It is therefore possible that people with clear eyesight can develop capacity to address the lack of light in winter over the centuries without falling into a seasonal decline.

Indeed, not the same color is the only factor in developing seasonal disorder. It can also contribute to improvement when people are spending too little time. These people will then help with excursions in the new air, especially when the sun is shining.

Phototherapy is also a very popular way of fighting in the winter with a grim and gloomy. You only have to sit in front of a full-light light for an hour every day, and people show a lot of development. But if the symptoms don't get worse or worse, it's appropriate to see a doctor and consider the use of a medicine.